 $(document).ready(function(){
        jQuery.navlevel2 = function(level1,dytime) {
            
              $(level1).mouseenter(function(){
                      varthis = $(this);
                      delytime=setTimeout(function(){
                        varthis.find('ul').slideDown();
                    },dytime);
                
              });
              $(level1).mouseleave(function(){
                     clearTimeout(delytime);
                     $(this).find('ul').slideUp();
              });
          
        };
      $.navlevel2("li.mainlevel",200);
});